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• ffplay : toggle full screen when double-clicking the video window with the left mouse...

  19 janvier 2016, par Vittorio Gambaletta (VittGam)

  ffplay : toggle full screen when double-clicking the video window with the left mouse button
  Now that the seek only happens with the right mouse button, it makes
  
  sense to toggle full screen when double-clicking with the left mouse
  
  button, like other video players do.
  Signed-off-by : Vittorio Gambaletta <ffmpeg-dev@vittgam.net>
  
  Signed-off-by : Marton Balint <cus@passwd.hu>
  

  • [DH] Changelog
  • [DH] ffplay.c

• How to call a Rust function that expects a double pointer to buffer

  7 octobre 2020, par Guerlando OCs

  I'm trying to map the following ffmpeg function : http://ffmpeg.org/doxygen/4.0/group__lavc__parsing.html#ga0dd9af605377fcbb49fffd982672d377 to Rust code

  


  int av_parser_parse2    (   AVCodecParserContext *      s,
        AVCodecContext *    avctx,
        uint8_t **      poutbuf,
        int *   poutbuf_size,
        const uint8_t *     buf,
        int     buf_size,
        int64_t     pts,
        int64_t     dts,
        int64_t     pos 
    )   


  


  Here's my Rust code sketch :

  


  fn parse2(
    &self, 
    av_codec_context: CodecContext,
    poutbuf: &mut [u8],
    poutbuf_size: &mut i32,
    buf: &[u8],
    pts: i64,
    dts: i64,
    pos: i64,
) -> Result {
    unsafe {// ptr::null(), ptr::null_mut()
        match av_parser_parse2(self.as_mut_ptr(),
        av_codec_context.as_mut_ptr(),
        poutbuf.as_mut_ptr(),
        poutbuf_size.as_mut_ptr(),
        buf.as_mut_ptr(),
        buf.len() as i32,
        pts,
        dts,
        pos
) {
        }
    }
}


  


  Here's the av_parser_parse2 generated by Rust's C bindings :

  


  pub fn av_parser_parse2(
    s: *mut AVCodecParserContext,
    avctx: *mut AVCodecContext,
    poutbuf: *mut *mut u8,
    poutbuf_size: *mut libc::c_int,
    buf: *const u8,
    buf_size: libc::c_int,
    pts: i64,
    dts: i64,
    pos: i64,
) -> libc::c_int


  


  I'm having problems in 2 arguments :

  


          poutbuf.as_mut_ptr(),
        poutbuf_size.as_mut_ptr(),


  


  How can I make a double pointer ? In ffmpeg the user would provide a pointer to an empty buffer and to a size, which would be ovewritten by the function av_parser_parse2. I think I don't want the poutbuf: &mut [u8], poutbuf_size: &mut i32, arguments. Maybe I need to return a fresh new Vec for every parse2 call ? So the return value for parse2 would be the tuple Vec, i32.

  


  So I think I should take off poutbuf and poutbuf_size from the arguments, and call av_parser_parse2 with something that will become the Vec to return. However, I cannot pass a Vec as a double pointer, because I do not know the size of the returned packet.

  


  How can I deal with the returned buffer ?

  


• avcodec/mpegaudiodec_template : use double to build csa tables

  17 avril 2015, par Michael Niedermayer

  avcodec/mpegaudiodec_template : use double to build csa tables
  Fixes rounding difference between 32bit x86 and 64bit
  
  Fixes fate failure with gapless mp3
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/mpegaudiodec_template.c
  • [DH] tests/ref/fate/gapless-mp3